Error Message Using Facebook Deprecated Headers - xcode

Question

I have an application in Xcode 4.5 which integrates Facebook. I am using ARC. The application uses
native dialogs and therefore deprecated headers (ie Facebook.h). Apparently doing so leads to the following
error when closing/cleaning the active session:
"An instance 0xa089350 of class
FBSessionManualTokenCachingStrategy was deallocated while key value observers were still registered
with it. Observation info was leaked, and may even become mistakenly attached to some other object."
Upon researching this error, I assume that the issue is that when I init an instance of self.Facebook in the app delegate, Facebook
adds two observers rather than one, and then only one is cleaned up during logout. I have made numerous attempts to remove both instances, including every solution on this
page regarding this very error: facebook ios sdk log : strange message
None of these solutions have worked for me, including one solution I saw which involved deallocation which I cannot use as I am using ARC. Here is my code for opening and closing a session for reference:
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState) state
error:(NSError *)error
{
switch (state) {
case FBSessionStateOpen:
if (!error) {
// We have a valid session
// Initiate a Facebook instance
self.facebook = [[Facebook alloc]
initWithAppId:FBSession.activeSession.appID
andDelegate:nil];
// Store the Facebook session information
self.facebook.accessToken = FBSession.activeSession.accessToken;
self.facebook.expirationDate = FBSession.activeSession.expirationDate;
}
break;
case FBSessionStateClosed:
case FBSessionStateClosedLoginFailed:
[FBSession.activeSession closeAndClearTokenInformation];
// Clear out the Facebook instance
self.facebook = nil;
break;
default:
break;
}
[[NSNotificationCenter defaultCenter]
postNotificationName:FBSessionStateChangedNotification
object:session];
if (error) {
UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle:#"Error"
message:error.localizedDescription
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alertView show];
}
}
/*
* Opens a Facebook session and optionally shows the login UX.
*/
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI //do I need this method?
{
NSArray *permissions = [[NSArray alloc] initWithObjects:
#"user_about_me",
#"read_friendlists",
#"read_stream",
#"friends_likes",
#"user_likes",
#"friends_photos",
#"user_photos",
nil];
return [FBSession openActiveSessionWithReadPermissions:permissions
allowLoginUI:allowLoginUI
completionHandler:^(FBSession *session,
FBSessionState state,
NSError *error) {
[self sessionStateChanged:session state:state
error:error]; }];
}
/*
* If we have a valid session at the time of openURL call, we handle
* Facebook transitions by passing the url argument to handleOpenURL
*/
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
// attempt to extract a token from the url
return [FBSession.activeSession handleOpenURL:url];
}
- (void) closeSession {
[FBSession.activeSession closeAndClearTokenInformation];
}
If anyone can offer any guidance as to how to solve this I would greatly appreciate it.